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In the Upper Blue River Drainage of the Mckenzie River Ranger District, Willamette National Forest

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In the Upper Blue River Drainage of the Mckenzie River Ranger District, Willamette National Forest FY2009 ISSSP Surveys for Salamander Slug [aka Axetail Slug] (Gliabates oregonius) in the Upper Blue River drainage of the McKenzie River Ranger District, Willamette National Forest. Authored by Joe Doerr and Tiffany Young, Wildlife Biologists, Willamette National Forest, 10/20/2009. In 2008, the salamander slug (Gliabates oregonius), also known as the axetail slug, was added to the sensitive species list for the Bureau of Land Management and the Forest Service in the Pacific Northwest. This species was first described as Gliabates oregonia from specimens collected in north-central Lane County (Webb 1959). The scientific name was subsequently changed to Gliabates oregonius by other researchers (Tom Burke personal communication). Gliabates oregonius is classified a S1 species endemic to Oregon and confirmed from a handful of locations in the Cascade and Coast Ranges within the Willamette River drainage. The mollusk is reported associated with conifer and leaf litter in Douglas-fir (Psuedotsuga menziesii) and western hemlock (Tsuga heterophylla) forest habitat. Due to its apparent low abundance and association with forest habitat, there is considerable potential for negative impacts from silvicultural activities, such as logging, fuel treatments and prescribed burning. There is a management need to better understand the abundance and distribution of this species. Following its inclusion on the sensitive species list, biologists on the McKenzie River Ranger District reviewed previous mollusk surveys conducted under the “Survey and Manage Program”. In their review they found a high number of reported detections of axetail slugs in the upper portion of the Blue River drainage. The reports showed detections of 139 individuals at 86 locations during surveys in the fall of 1998 and the spring of 1999 connected with a timber sale planned in that area. For an S1 species, this high detection rate is noteworthy. However, Gliabates oregonius was not a “Survey and Manage” species at the time. Some specimens were sent to regional experts, but identification was unclear. No specimens were vouchered and the locations were not entered into the corporate GIS wildlife database. Except for underburning in one unlogged stand, the planned timber sale where the axetail slugs were reportedly found has not yet been implemented. In fall 2009 this ISSSP project was initiated to resurvey a sample of the reported locations in the Blue River drainage, obtain voucher specimens, confirm identification of any suspected Gliabates found, and document locations of any confirmed salamander slugs or other sensitive species in NRIS Wildlife. Methods: The 86 “axetail” locations from 1998−1999 were plotted on a map and labeled sequentially by location. Every third location was selected systematically for resurveying, thus distributing the resampling effort geographically among points. The general location of these sites with reference to the Willamette National forest is shown in the attached map. Ninety-two percent of the 1998−1999 reported locations were from fall surveys so mollusk surveys in this project were conducted in fall 2008 rather than in spring. Each location surveyed was located from GPS coordinates (and in a few cases from the remains of 10-year-old survey flagging). A one-hour mollusk search was done in the most likely habitat in the vicinity of the location (generally within a 1-acre area surrounding the GPS location) following Duncan et al. 2003. Each one-hour survey consisted of two 20-minute intensive searches of conifer needle and deciduous leaf litter 1 plus 20 minutes of walk-about spot searching in likely habitat for a total search time of one hour/site. A training session was held with Nancy Duncan, BLM mollusk expert, on October 15, 2008. Field conditions were found to be too dry at that time for successful detection of mollusks, but searching techniques, identification from photos, and field protocols were reviewed. Surveys with adequate moisture conditions were conducted from November 5−23, 2008, by Forest Service wildlife personnel. Tiffany Young, Ruby Seitz, Shane Kamrath, Chad Marks-Fife, Juan Carlos Valarezo, and Joe Doerr participated in the November surveys. A field form for reporting fauna and habitat observation is shown in Appendix 1. Results: Detections occurred throughout the November surveys, including the first and last days surveyed so all surveys conducted that month were considered valid. Twenty six of the 28 systematically selected sites were surveyed in November. Of the remaining two sites, one was not surveyed because snow blocked access and the other was surveyed in October but was not resurveyed in November due to lack of time. Salamander slugs were detected at 11 of the 26 selected sites (42%) with a total of 27 individuals found during the one-hour searches. Ten of the other previous locations that were not systematically selected were also resurveyed in November. Salamander slugs were detected at 4 of these locations. Since this detection rate (40%) was close to the rate at the systematically selected sites, both data were combined. Overall, we detected salamander slugs at 15 of 36 sites (42%) where they had been reported found in 1998−1999 and located a total of 34 individuals. Incidentally we surveyed 2 other nearby sites in the Blue River drainage and had no detections. Tiffany Young surveyed 1site in the adjacent Canyon Creek drainage on the Sweet Home Ranger District to the north and detected three individuals. Canyon Creek is part of the South Santiam River watershed. Initially our intent was to also survey for the Oregon slender salamander (Batrachoseps wrightorum [BAWR]). The microhabitat for the salamander slug (see below) was too different to allow for both species to be adequately searched in a single hour. We therefore concentrated on the mollusk and searched for salamanders only incidentally by uncovering suitable woody debris that was obvious and in close proximity to the other survey effort. A total of four BAWR were detected at a 3 sites. Fourteen voucher specimens were collected. These were sent to Tom Burke, William Leonard, and Lyle Chichester for verification. From external appearance the mollusks match the description of Gliabates oregonius. Internal examinations by Lyle Chichester have not matched many of the characteristics described by Webb (1959) [Tom Burke personal communication]. G. oregonius is the only species of Gliabates and there are no readily apparent look-alikes. If the individuals are not oregonius, then it is possible they represent a previously undescribed species. While this taxonomic dilemma is being resolved, this report will refer to the individuals as Gliabates oregonius. The Gliabates oregonius individuals found in this study had the following characteristics: - Clear white translucent head with brown antennae. - Body translucent with brown striation. 2 - Slightly papillose mantle and tail. This “bumpiness” is more texture than true papillose. - Slightly papillose tail. Tail shows more of a reticulation than papillose. - Mantle is ¾ of body length. - Tail is ¼ of body length. - Slight notch at the junction of the tail and the mantle. - The size range of individuals was 0.4 to 2 cm in total length. The slugs were found in conifer stands in the western hemlock series dominated by Douglas-fir with a vine maple (Acer circinatum) understory. Areas where vine maple leaves had fallen and formed a cover to hold moisture in a Douglas-fir needle litter/duff layer seemed to be the preferred microhabitat for Gliabates oregonius. Places where down wood had created pockets for leaf litter and moisture to collect also seemed to be selected by Gliabates oregonius. Most specimens found in 2008 were located in a very moist Douglas-fir needle litter/duff layer approximately 1 inch below the surface, between the current year’s needle layer and the compacted layer of previous years, with a vine maple leaf layer on the top. Gliabates oregonius detections in the Blue River watershed were in stands from 40 to 120 years of age and in one late-successional forest that had been underburned two growing seasons prior to surveying. The Canyon Creek stand where Gliabates oregonius was found was 30 years of age. Gliabates oregonius were detected at elevations ranging from 3000 to 4100 feet and throughout the geographic area searched in the upper Blue River watershed. An average of 2.1 individuals (range 1−7) was found at sites where detections were made (n=16). The median number found at these occupied sites was 1.5 with a mode of 1 (Table 1). Discussion: We believe that our results reflect a relatively good abundance of Gliabates oregonius within our project area. Descriptions of the axetail slugs by the observers conducting the 1998−1999 surveys and the number of individuals found at a sample of these sites in 2008 support the conclusion that the past detections are valid. Both the 2008 surveys and the previous 1998−1999 detections will be entered into the NRIS Wildlife database. Our results suggest that Gliabates oregonius occupy a broad range of age classes in Douglas-fir forest and we postulate that they are closely associated with microsites defined by specific leaf and needle litter and moisture conditions. Since multiple surveys were not conducted at single sites, we cannot estimate the probability of false absences (i.e. not detecting the species when it is present). Therefore we are uncertain if the 60% of resurveyed sites where Gliabates oregonius were not found are unoccupied. Only one of the sites resurveyed in 2008 had received any silvicultural management activity since 1998. The one site had received a prescribed underburn in spring 2007 that greatly reduced the leaf litter and duff layer. Gliabates oregonius was detected at this site in 2008, providing a single case documenting the mollusk persisting after this treatment. 3 Literature Cited Duncan, N., T. Burke, S. Dowlan, and P. Hohenlohe. 2003. Survey Protocol for survey and manage terrestrial mollusk species from the Northwest Forest Plan.
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